Each processing node requires to be activated with the separate license of Metashape Professional. Metashape Professional instance that is acting as a network processing server does not require to be activated.
So, for example, for a solution with 1 server and 10 processing nodes working simultaneously (all running on 11 different computers), it is required to have 10 node-locked licenses activated on each node, floating license with count 10 accessible by all nodes, or a combination of node-locked/floating licenses with the total number of 10.
The client machine, where from the network processing is started, also requires to have Metashape Professional license activated. And if the same computer is used both as a processing node and as a client, then only a single license is required for such a computer.